A rundown tennis club in Moscow, usable outdoor courts only four months a year, has produced more top-20 ranked women's players than the entire United States. That's not a story about talent. It's a story about a system, and it's the same system we've been building all series.

This is the finale of the Cracking the Talent Code series, and I'm pulling everything together, the wire, the gap, the spark, and the coaching, into four questions you can actually run on yourself before your next round.

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